[acjohnson55]

Good point that stepwise tonal motion is much more apparent in standard notation. Maybe there would be a way to augment the notation for that, perhaps at the cost of losing some of the commonalities they kept. For instance, if you're willing to play with the duration notation, maybe you can use filled-in notes for notes within the key and hollow notes for accidentals. Or something.

Or maybe they could have done the staff lines differently.